Option risk Calculate and compare the risk (betas) of the following investments: (a) a share of Amazon stock; (b) a one-year call option on Amazon; (c) a one-year put option; (d) a portfolio consisting of a share of Amazon stock and a one-year put option; (e) a portfolio consisting of a share of Amazon stock, a one-year put option, and the sale of a one-year call. In each case, assume that the exercise price of the option is $900, which is also the current price of Amazon stock.
a)
To determine: Risk (beta) share of Company A’s stock
Explanation of Solution
The stock beta of Company A’s stock is 1.5
b)
To determine: One year call option on Company A.
Explanation of Solution
Given information:
Current stock selling price (P) is $900
Exercise price (EX) is $900
Standard deviation (σ) is 0.25784
Risk free rate (rf) is 0.01 annually,
t = 1
Stock beta is 1.5
Calculation of value of call option:
The value of
The value of
Therefore,
Hence, the value of call option is $96.39
Person X has investing $509.86 and he borrows $413.48,
Calculation of option beta:
Therefore, the option beta is $7.93
c)
To determine: One year put option.
Explanation of Solution
Calculation of one year put option:
From the put-call parity relationship,
Therefore, to replicate the put pay-offs, person X would buy a call with $400 as an exercise price and invest the present value of exercise price and sell the short stock.
The risk can be as follows,
Therefore risk is -6.7
d)
To determine: One share stock plus one put option.
Explanation of Solution
Calculation of one share plus one option:
It is related to previous question, except the stock positions cancel out, which leaves us with an exercise price of $900 investment in the present value of exercise price.
The risk can be as follows,
Therefore, risk is 0.77 which partially hedged the position.
e)
To determine: One share stock plus one put option minus one call option.
Explanation of Solution
Calculation of one share plus one option minus one call option:
It is related to previous question, except the all call positions cancel out, which leaves us with an investment in the present value of exercise price.
The risk can be as follows,
Therefore, risk is 0.00 which reduced our position to risk-free loan.
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Chapter 21 Solutions
PRIN.OF CORPORATE FINANCE
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